SHA-1 is a hash function created in 1993.
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In cryptography, SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function which takes an input and produces a 160-bit (20-byte) hash value known as a message digest – typically rendered as a hexadecimal number, 40 digits long. It was designed by the United States National Security Agency, and is a U.S. Federal Information Processing Standard.Since 2005 SHA-1 has not been considered secure against well-funded opponents, as of 2010 many organizations have recommended its replacement. Read more on Wikipedia...